Lindsay Lohan might lose birthday sponsors

X17online Lindsay Lohan checking into the Promises rehab facility could cost her hundreds of thousands of dollars in sponsorships for her upcoming 21st birthday party. Svedka vodka has already backed out, and now other prospective partners (including Caesars Palace, the Social House restaurant at Treasure Island, and Pure nightclub) are considering backing out too because of stricter underage drinking rules in Vegas. An insider tells Gatecrasher: "Rules are much stricter in Vegas than in New York or L.A. because we have casino gaming [licenses]. When Ashlee Simpson did her 21st at Pure, they had to keep her on the red carpet literally until 12:01 a.m. on the day of her birthday." Lindsay's currently in a 30-day rehab program which will discharge her less than a week before her two-day birthday party in Vegas. It'd be like Rosie O'Donnell fasting for a month and then being let loose in a buffet. Or a farm. Or an elementary school. Basically anywhere she can find something to fit into her mouth.